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          STM32MP1: Boot kernel via TFTP from U-Boot
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        <p>Today I just managed to boot kernel via TFTP on STM32MP1 board but steps I go through are quite different with i.MX8. Thus, I think there is a necessity to have a short note about this 🖋</p>
<a id="more"></a>

<h2 id="Pre-requirements"><a href="#Pre-requirements" class="headerlink" title="Pre-requirements"></a>Pre-requirements</h2><ul>
<li>TFTP server on PC is up and running(<a href="https://lzqblog.top/2019-05-26/i-MX-setup-TFTP-and-NFS/">Check here</a>)</li>
<li>Board and PC are in same LAN</li>
</ul>
<h2 id="TFTP-folder"><a href="#TFTP-folder" class="headerlink" title="TFTP folder"></a>TFTP folder</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">~/data/srv/tftp$ tree</span><br><span class="line">.</span><br><span class="line">├── pxelinux.cfg</span><br><span class="line">│   └── 01-e2-a4-06-a5-8f-7f</span><br><span class="line">├── stm32mp157a-cp.dtb</span><br><span class="line">└── uImage</span><br><span class="line"></span><br><span class="line">1 directory, 3 files</span><br></pre></td></tr></table></figure>
<p>U-Boot will use <code>pxe</code> command to load PXE configuration file from TFTP server(PC in my scenario). PXE configuration file has the same format with <em>extlinux.conf</em>, and the file name is related to hardware MAC address. In my case <span style="color:red"><em>01-e2-a4-06-a5-8f-7f</em></span>:</p>
<ul>
<li>01: ARP type 1 for ethernet</li>
<li>e2-a4-06-a5-8f-7f: MAC address</li>
</ul>
<p>Inside my PXE configuration file(01-e2-a4-06-a5-8f-7f):</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">menu title Select the boot mode</span><br><span class="line"> DEFAULT eMMC</span><br><span class="line"> TIMEOUT 20</span><br><span class="line"> LABEL initramfs</span><br><span class="line"> 	KERNEL uImage</span><br><span class="line"> 	FDT stm32mp157a-cp.dtb</span><br><span class="line"> 	INITRD uInitrd</span><br><span class="line"> 	APPEND rootwait rw earlyprintk console&#x3D;ttySTM0,115200</span><br><span class="line"> LABEL nfs</span><br><span class="line"> 	KERNEL uImage</span><br><span class="line"> 	FDT stm32mp157a-cp.dtb</span><br><span class="line"> 	APPEND root&#x3D;&#x2F;dev&#x2F;nfs nfsroot&#x3D;192.168.0.106:&#x2F;nfsroot ip&#x3D;dhcp rootwait rw earlyprintk console&#x3D;ttySTM0,115200</span><br><span class="line"> LABEL sdcard</span><br><span class="line"> 	KERNEL uImage</span><br><span class="line"> 	FDT stm32mp157a-cp.dtb</span><br><span class="line"> 	APPEND root&#x3D;&#x2F;dev&#x2F;mmcblk0p6 rootwait rw earlyprintk console&#x3D;ttySTM0,115200</span><br><span class="line"> LABEL eMMC</span><br><span class="line"> 	KERNEL uImage</span><br><span class="line"> 	FDT stm32mp157a-cp.dtb</span><br><span class="line"> 	APPEND root&#x3D;&#x2F;dev&#x2F;mmcblk1p6 rootwait rw earlyprintk console&#x3D;ttySTM0,115200</span><br></pre></td></tr></table></figure>
<p>With this configuration file we could choose in U-Boot where to load rootfs when booting.</p>
<h2 id="U-Boot"><a href="#U-Boot" class="headerlink" title="U-Boot"></a>U-Boot</h2><p>After TFTP server and folder are ready, we can proceed on U-Boot. If <code>CONFIG_NET_RANDOM_ETHADDR</code> has not been set in uboot defconfig or MAC address haven’t been configured before, we might need to setup MAC address(<span style="color:red"><em>ethaddr</em></span>) manually. Meanwhile <span style="color:red"><em>serverip</em></span> need to be set as well:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">env set ethaddr e2:a4:06:a5:8f:7f</span><br><span class="line">env set serverip 192.168.0.106</span><br><span class="line">saveenv</span><br></pre></td></tr></table></figure>
<p>After that we only need to <code>run bootcmd_pxe</code> if we want to load kernel from TFTP:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br></pre></td><td class="code"><pre><span class="line">Hit any key to stop autoboot:  0 </span><br><span class="line">STM32MP&gt; run bootcmd_pxe</span><br><span class="line">ethernet@5800a000 Waiting for PHY auto negotiation to complete. done</span><br><span class="line">BOOTP broadcast 1</span><br><span class="line">DHCP client bound to address 192.168.0.101 (2 ms)</span><br><span class="line">missing environment variable: pxeuuid</span><br><span class="line">missing environment variable: bootfile</span><br><span class="line">Retrieving file: pxelinux.cfg&#x2F;01-e2-a4-06-a5-8f-7f</span><br><span class="line">Using ethernet@5800a000 device</span><br><span class="line">TFTP from server 192.168.0.106; our IP address is 192.168.0.101</span><br><span class="line">Filename &#39;pxelinux.cfg&#x2F;01-e2-a4-06-a5-8f-7f&#39;.</span><br><span class="line">Load address: 0xc4200000</span><br><span class="line">Loading: #</span><br><span class="line">         8.8 KiB&#x2F;s</span><br><span class="line">done</span><br><span class="line">Bytes transferred &#x3D; 608 (260 hex)</span><br><span class="line">Config file found</span><br><span class="line">Select the boot mode</span><br><span class="line">1:      initramfs</span><br><span class="line">2:      nfs</span><br><span class="line">3:      sdcard</span><br><span class="line">4:      eMMC</span><br><span class="line">Enter choice: 4:        eMMC</span><br><span class="line">missing environment variable: bootfile</span><br><span class="line">Retrieving file: uImage</span><br><span class="line">Using ethernet@5800a000 device</span><br><span class="line">TFTP from server 192.168.0.106; our IP address is 192.168.0.101</span><br><span class="line">Filename &#39;uImage&#39;.</span><br><span class="line">Load address: 0xc2000000</span><br><span class="line">Loading: #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         ##################T ###############################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         #################################################################</span><br><span class="line">         ##############################################################</span><br><span class="line">         265.6 KiB&#x2F;s</span><br><span class="line">done</span><br><span class="line">Bytes transferred &#x3D; 6640192 (655240 hex)</span><br><span class="line">append: root&#x3D;&#x2F;dev&#x2F;mmcblk1p6 rootwait rw earlyprintk console&#x3D;ttySTM0,115200</span><br><span class="line">missing environment variable: bootfile</span><br><span class="line">Retrieving file: stm32mp157a-cp.dtb</span><br><span class="line">Using ethernet@5800a000 device</span><br><span class="line">TFTP from server 192.168.0.106; our IP address is 192.168.0.101</span><br><span class="line">Filename &#39;stm32mp157a-cp.dtb&#39;.</span><br><span class="line">Load address: 0xc4000000</span><br><span class="line">Loading: #############</span><br><span class="line">         188.5 KiB&#x2F;s</span><br><span class="line">done</span><br><span class="line">Bytes transferred &#x3D; 62891 (f5ab hex)</span><br><span class="line">## Booting kernel from Legacy Image at c2000000 ...</span><br><span class="line">   Image Name:   Linux-4.19.49</span><br><span class="line">   Created:      2019-06-09   7:17:25 UTC</span><br><span class="line">   Image Type:   ARM Linux Kernel Image (uncompressed)</span><br><span class="line">   Data Size:    6640128 Bytes &#x3D; 6.3 MiB</span><br><span class="line">   Load Address: c2000040</span><br><span class="line">   Entry Point:  c2000040</span><br><span class="line">   Verifying Checksum ... OK</span><br><span class="line">## Flattened Device Tree blob at c4000000</span><br><span class="line">   Booting using the fdt blob at 0xc4000000</span><br><span class="line">   XIP Kernel Image ... OK</span><br><span class="line">   Using Device Tree in place at c4000000, end c40125aa</span><br><span class="line"></span><br><span class="line">Starting kernel ...</span><br><span class="line"></span><br><span class="line">[    0.000000] Booting Linux on physical CPU 0x0</span><br><span class="line">[    0.000000] Linux version 4.19.49 (oe-user@oe-host) (gcc version 8.2.0 (GCC)) #1 SMP PREEMPT Sun Jun 9</span><br><span class="line">[    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr&#x3D;10c5387d</span><br></pre></td></tr></table></figure>

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